Four Seasons 36964 Engine Cooling Fan Clutch

Engine Cooling Fan Clutch for Classic Ford and Chevy Applications

Four Seasons Fan Clutch 36964 is a standard-duty thermal engine cooling fan clutch built with an aluminum body and standard rotation. It is a non-electronic, flange-mount design with a 7.2-inch maximum diameter and a 4-bolt pattern for direct replacement use in select Ford, Mercury, and Chevrolet applications.

Compatible With classic Ford Mustang, Thunderbird, Bronco, E-100 Econoline, and Mercury Cougar applications, this Four Seasons 36964 fan clutch is also listed for Chevrolet Corvette models. It meets or exceeds OEM requirements and is performance rated for dependable cooling fan engagement in the right operating range.

Key Features

• Four Seasons Fan Clutch line, part number 36964
• Standard-duty thermal clutch with standard rotation
• Aluminum construction with raw aluminum finish
• Flange mounting style with 4 bolt holes and 4 mounting holes
• 7.2-inch clutch diameter and 2.98-inch overall height
• Non-electronic design for mechanical cooling fan systems
• Meets or exceeds OEM specifications
• Performance rated for replacement cooling service

Detailed Description

The Four Seasons 36964 fan clutch is a thermal engine cooling fan clutch engineered for vehicles that use a standard rotation, flange-mounted mechanical fan setup. Its aluminum construction helps provide a durable, lightweight replacement solution, while the 3-inch fan bolt circle and 5/16-18 bolt holes support proper fan attachment in the specified applications. This part number 36964 is listed across a wide range of classic Ford and Mercury platforms, including Ford Fairmont, LTD, Mustang, Thunderbird, Bronco, and E-100 Econoline, plus Mercury Capri, Cougar, Marquis, Montego, and Grand Marquis. It is also cataloged for Chevrolet Corvette applications.

This Four Seasons Fan Clutch product line focuses on direct-fit cooling system service parts for mechanical fan assemblies. For buyers searching for a thermal fan clutch for 1970s and early 1980s Ford and Mercury vehicles, or a replacement fan clutch for Chevrolet Corvette cooling service, 36964 provides a specification-driven match based on mounting style, rotation, and diameter.

This part cross-references Gates 21037 and Dorman - HELP 77234 for the same application.

What It Helps Address

• Cooling fan engagement that is inconsistent or delayed
• Excessive engine temperature at idle or low road speed
• Fan clutch noise caused by worn internal components
• Reduced airflow through the radiator in mechanical fan systems
• Replacement needs for standard rotation thermal fan clutch service

Installation Notes and Tips

• Verify the vehicle uses a standard rotation, flange-mount fan clutch before ordering.
• Confirm fan bolt circle, pilot diameter, and mounting dimensions against the original part.
• Mounting hardware is not included.
• Inspect the fan blade, water pump hub, and surrounding cooling components during replacement.
• Follow the vehicle service manual for torque and clearance checks after installation.

Quality Assurance

Four Seasons 36964 is a new, performance-rated fan clutch that meets or exceeds OEM requirements. Its specification set is built for direct replacement service in listed Ford, Mercury, and Chevrolet applications.